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Doc: improve documentation about random().

We didn't explicitly say that random() uses a randomly-chosen seedif you haven't called setseed(). Do so.Also, remove ref/set.sgml's no-longer-accurate (and never veryrelevant) statement that the seed value is multiplied by 2^31-1.Back-patch to v12 where set.sgml's claim stopped being true.The claim that we use a source of random bits as seed was debatablebefore4203842, too, so v12 seems like a good place to stop.Per question from Carl Sopchak.Discussion:https://postgr.es/m/f37bb937-9d99-08f0-4de7-80c91a3cfc2e@sopchak.me

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doc/src/sgml
- func.sgml
- ref
  - set.sgml

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`‎doc/src/sgml/func.sgml`

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Original file line number	Diff line number	Diff line change
`@@ -1840,6 +1840,9 @@ repeat('Pg', 4) <returnvalue>PgPgPgPg</returnvalue>`
`1840`	`1840`	`subsequent <function>random()</function> calls in the current session`
`1841`	`1841`	`can be repeated by re-issuing <function>setseed()</function> with the same`
`1842`	`1842`	`argument.`
	`1843`	`+ Without any prior <function>setseed()</function> call in the same`
	`1844`	`+ session, the first <function>random()</function> call obtains a seed`
	`1845`	`+ from a platform-dependent source of random bits.`
`1843`	`1846`	`</para>`
`1844`	`1847`
`1845`	`1848`	`<para>`

`‎doc/src/sgml/ref/set.sgml`

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Original file line number	Diff line number	Diff line change
`@@ -175,8 +175,7 @@ SET [ SESSION \| LOCAL ] TIME ZONE { <replaceable class="parameter">timezone</rep`
`175`	`175`	`<para>`
`176`	`176`	`Sets the internal seed for the random number generator (the`
`177`	`177`	`function <function>random</function>). Allowed values are`
`178`		`- floating-point numbers between -1 and 1, which are then`
`179`		`- multiplied by 2<superscript>31</superscript>-1.`
	`178`	`+ floating-point numbers between -1 and 1 inclusive.`
`180`	`179`	`</para>`
`181`	`180`
`182`	`181`	`<para>`

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Commit31d5354

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`‎doc/src/sgml/func.sgml`

`‎doc/src/sgml/ref/set.sgml`

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